Second screen?
Most of us only use one.
You can sandwich the bud between two screens above the heating tube but thats not how its intended to be used by the maker
Definitely some people use the supreme with an electric stove, just be careful and watch it well
Are you not filling up the silver heating tube?
Bud is supposed to go down there, doesnt get all up in the block.
Its pretty simple to load, you can just tap ground herb into the large chamber and then tap the sides while holding it at the right angle and all the herb will fall down the heating tube.
I often dump contents while its hot, crumble it a bit with my fingers and pour it back after a few.
And temperature wise, the first carcinogen (benezene) starts leeching out @ around 325, so there's that reason not to go higher than that. Also, if you consistently go past 330, the metal block can become slightly loose and can rattle, and the maker said if you take it too hot wayyy too many times it can become unusable.
If you havent looked at this pic it shows how it all works